Unhandled touch events need to be ignored in order for things like
mouse event synthetization in QtGui to work.

Change-Id: I6fe9dad205c8bb8547d2424c2e2a3b3518598006
Reviewed-by: Andras Becsi <andras.becsi@nokia.com>
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>